Add device_changed signal (#4412)

This provides both the original and updated version of the Device so
subscribers can see the changes.

src/pretix/api/views/device.py

@@ -200,6 +200,11 @@ class UpdateView(APIView):
         device.save()
         device.log_action('pretix.device.updated', data=serializer.validated_data, auth=device)
 
+        from ...base.signals import device_info_updated
+        device_info_updated.send(
+            sender=Device, old_device=request.auth, new_device=device
+        )
+
         serializer = DeviceSerializer(device)
         return Response(serializer.data)
 

src/pretix/base/signals.py

@@ -838,3 +838,12 @@ is given as the first argument.
 
 The ``sender`` keyword argument will contain the organizer.
 """
+
+device_info_updated = django.dispatch.Signal()
+"""
+Arguments: ``old_device``, ``new_device``
+
+This signal is sent out each time the information for a Device is modified.
+Both the original and updated versions of the Device are included to allow
+receivers to see what has been updated.
+"""